I wish those two bits of advice always worked nowadays. Sadly, there's still times they don't. Anyway:

Your question has already been answered, BUT, once you have the images, there are two commands in x-term to flash with:

softupd -D --local
flasher --local -f [path to and name of image being flashed]

I am pretty sure this should do it.

- Edit -

Run as root, obviously, and one after the other, in that order.